CONTENTS Foreword... xiii Statements of Policy... xv Personnel... xvii Organization of Section III... xxvii Summary of Changes... xxxi Article NB-1000 Introduction... 1 NB-1100 Scope... 1 NB-1110 Aspects of Construction Covered by These Rules... 1 NB-1120 Temperature Limits... 1 NB-1130 Boundaries of Jurisdiction Applicable to This Subsection... 1 NB-1140 Electrical and Mechanical Penetration Assemblies... 2 Figures NB-1132.2-1 Attachments in the Component Support Load Path That Do Not Perform a Pressure-Retaining Function... 3 NB-1132.2-2 Attachments That Do Not Perform a Pressure-Retaining Function and Are Not in the Component Support Load Path (Nonstructural Attachments)... 4 NB-1132.2-3 Attachments That Perform a Pressure-Retaining Function... 5 NB-1132.2-4 Attachments Within the Reactor Pressure Vessel (Core Support Structures) That Do Not Perform a Pressure-Retaining Function... 6 Article NB-2000 Material... 7 NB-2100 General Requirements for Material... 7 NB-2110 Scope of Principal Terms Employed... 7 NB-2120 Pressure-Retaining Material... 7 NB-2130 Certification of Material... 9 NB-2140 Welding Material... 9 NB-2150 Material Identification... 9 NB-2160 Deterioration of Material in Service... 9 NB-2170 Heat Treatment to Enhance Impact Properties... 9 NB-2180 Procedures for Heat Treatment of Material... 9 NB-2190 Nonpressure-Retaining Material... 9 NB-2200 Material Test Coupons and Specimens for Ferritic Steel Material... 10 NB-2210 Heat Treatment Requirements... 10 NB-2220 Procedure for Obtaining Test Coupons and Specimens for Quenched and Tempered Material... 10 NB-2300 Fracture Toughness Requirements for Material... 12 NB-2310 Material to Be Impact Tested... 12 NB-2320 Impact Test Procedures... 13 v
NB-2330 Test Requirements and Acceptance Standards... 14 NB-2340 Number of Impact Tests Required... 15 NB-2350 Retests... 16 NB-2360 Calibration of Instruments and Equipment... 16 NB-2400 Welding Material... 16 NB-2410 General Requirements... 16 NB-2420 Required Tests... 16 NB-2430 Weld Metal Tests... 18 NB-2440 Storage and Handling of Welding Material... 20 NB-2500 Examination and Repair of Pressure-Retaining Material... 20 NB-2510 Examination of Pressure-Retaining Material... 20 NB-2520 Examination After Quenching and Tempering... 22 NB-2530 Examination and Repair of Plate... 22 NB-2540 Examination and Repair of Forgings and Bars... 23 NB-2550 Examination and Repair of Seamless and Welded (Without Filler Metal) Tubular Products and Fittings... 25 NB-2560 Examination and Repair of Tubular Products and Fittings Welded With Filler Metal... 29 NB-2570 Examination and Repair of Statically and Centrifugally Cast Products... 29 NB-2580 Examination of Bolts, Studs, and Nuts... 37 NB-2600 Material Organizations Quality System Programs... 39 NB-2610 Documentation and Maintenance of Quality System Programs... 39 NB-2700 Dimensional Standards... 39 Figures NB-2433.1-1 Weld Metal Delta Ferrite Content... 21 NB-2552-1 Axial Propagation of Sound in Tube Wall... 27 NB-2575.2-1 Typical Pressure-Retaining Parts of Pumps and Valves... 34 Tables NB-2332(a)-1 Required C v Values for Piping, Pumps, and Valves... 15 NB-2333-1 Required C v Values for Bolting Material... 15 NB-2432.1-1 Sampling of Welding Materials for Chemical Analysis... 19 NB-2432.2(a)-1 Chemical Analysis for Reactor Vessel Welding Material... 20 NB-2432.2(a)-2 Chemical Analysis for Welding Material for Other Than Reactor Vessel Welds... 20 NB-2571-1 Required Examinations... 30 Article NB-3000 Design... 40 NB-3100 General Design... 40 NB-3110 Loading Criteria... 40 NB-3120 Special Considerations... 41 NB-3130 General Design Rules... 41 NB-3200 Design by Analysis... 46 NB-3210 Design Criteria... 46 NB-3220 Stress Limits for Other Than Bolts... 52 vi
NB-3230 Stress Limits for Bolts... 67 NB-3300 Vessel Design... 68 NB-3310 General Requirements... 68 NB-3320 Design Considerations... 68 NB-3330 Openings and Reinforcement... 69 NB-3340 Analysis of Vessels... 77 NB-3350 Design of Welded Construction... 77 NB-3360 Special Vessel Requirements... 80 NB-3400 Pump Design... 81 NB-3410 General Requirements for Centrifugal Pumps... 81 NB-3420 Definitions... 82 NB-3430 Design Requirements for Centrifugal Pumps... 82 NB-3440 Design of Specific Pump Types... 83 NB-3500 Valve Design... 85 NB-3510 Acceptability... 85 NB-3520 Design Considerations... 87 NB-3530 General Rules... 88 NB-3540 Design of Pressure-Retaining Parts... 90 NB-3550 Cyclic Loading Requirements... 104 NB-3560 Design Reports... 105 NB-3590 Pressure Relief Valve Design... 105 NB-3600 Piping Design... 110 NB-3610 General Requirements... 110 NB-3620 Design Considerations... 112 NB-3630 Piping Design and Analysis Criteria... 112 NB-3640 Pressure Design... 114 NB-3650 Analysis of Piping Products... 123 NB-3660 Design of Welds... 129 NB-3670 Special Piping Requirements... 130 NB-3680 Stress Indices and Flexibility Factors... 132 NB-3690 Dimensional Requirements for Piping Products... 144 Figures NB-3213-1 Examples of Reversing and Nonreversing Dynamic Loads... 50 NB-3221-1 Stress Categories and Limits of Stress Intensity for Design Conditions... 56 NB-3222-1 Stress Categories and Limits of Stress Intensity for Level A and Level B NB-3224-1 Service Limits... 57 Stress Categories and Limits of Stress Intensity for Level C Service Limits... 63 NB-3332.2-1 Chart for Determining Value of F... 70 NB-3338.2(a)-1 Direction of Stress Components... 72 NB-3338.2(a)-2 Nozzle Dimensions... 73 NB-3339.1(b)-1 Examples of Acceptable Transition Details... 75 NB-3339.4-1 Limits of Reinforcing Zone... 76 NB-3351-1 Welded Joint Locations Typical of Categories A, B, C, and D... 78 NB-3352-1 Typical Butt Joints... 79 NB-3361-1 Category A and B Joints Between Sections of Unequal Thickness... 80 NB-3423-1 Typical Single Volute Casing... 82 vii
NB-3423-2 Typical Double Volute Casing... 82 NB-3433.4-1 Minimum Tangential Inlet and Outlet Wall Thickness... 83 NB-3441.1-1 Type A Pump... 84 NB-3441.1-2 Type A Pump... 84 NB-3441.2-1 Type B Pump... 85 NB-3441.3-1 Type C Pump... 85 NB-3441.3-2 Type C Pump... 85 NB-3441.4(a)-1 Type D Pump... 86 NB-3441.5-1 Type E Pump... 86 NB-3441.6(a)-1 Type F Pump... 86 NB-3544.1(a)-1 Fillets and Corners... 92 NB-3544.1(c)-1 Ring Grooves... 92 NB-3544.3-1 Lugs and Protuberances... 93 NB-3544.7-1 Flat Wall Limitation... 94 NB-3545.1(a)-1 Pressure Area Method... 95 NB-3545.2(a)-1 Critical Sections of Valve Bodies... 98 NB-3545.2(c)-1 Model for Determining Secondary Stress in Valve Crotch Region... 100 NB-3545.2(c)-3 Thermal Stress Index Versus Thickness Continuity Run or Branch... 101 NB-3545.2(c)-4 Secondary Stress Index Versus Thickness Discontinuity Run or Branch... 102 NB-3545.2(c)-5 C 4 Versus T e1 /t e... 103 NB-3545.2(c)-6 Stress Index for Thermal Fatigue... 103 NB-3591.1-1 Typical Pressure Relief Devices... 106 NB-3591.1-2 Typical Pressure Relief and Safety Relief Devices... 107 NB-3594.3-1 Valve Nozzle... 109 NB-3622-1 Examples of Reversing and Nonreversing Dynamic Loads... 113 NB-3643.3(a)-1 Branch Connection Nomenclature... 117 NB-3643.3(a)-2 Typical Reinforcement of Openings... 118 NB-3643.3(a)-3 Typical Reinforced Extruded Outlet... 119 NB-3644(b)-1 Miter Joint Geometry... 121 NB-3647.2-1 Types of Permanent Blanks... 123 NB-3653.2(b)-1 Decomposition of Temperature Distribution Range... 126 NB-3683.1(c)-1... 135 NB-3683.1(d)-1... 135 NB-3683.6-1... 138 NB-3684-1 Direction of Stress Components... 140 NB-3685.2-1 Elbow Nomenclature... 143 NB-3686.1-1... 143 NB-3686.2-1... 143 NB-3686.5-1 Branch Connections in Straight Pipe... 144 Tables NB-3132-1 Dimensional Standards... 42 NB-3217-1 Classification of Stress Intensity in Vessels for Some Typical Cases... 53 NB-3217-2 Classification of Stress Intensity in Piping, Typical Cases... 55 NB-3228.5(b)-1 Values of m, n, and T max for Various Classes of Permitted Materials... 67 NB-3338.2(c)-1 Stress Indices for Nozzles... 74 NB-3339.3-1 Required Minimum Reinforcing Area A r... 75 NB-3339.7(c)-1 Stress Indices for Internal Pressure Loading... 77 NB-3641.1(a)-1 Values of A... 115 NB-3642.1(b)-1 Bend Radius Versus Thickness... 116 NB-3681(a)-1 Stress Indices for Use With Equations in NB-3650... 133 NB-3685.1-1 Curved Pipe or Welding End Elbows, Internal Pressure... 141 NB-3685.1-2 Curved Pipe or Welding End Elbows, Moment Loading ( 0.2)... 142 viii
NB-4100 General Requirements... 145 NB-4110 Introduction... 145 NB-4120 Certification of Materials and Fabrication by Certificate Holder... 145 NB-4130 Repair of Material... 146 NB-4200 Forming, Fitting, and Aligning... 146 NB-4210 Cutting, Forming, and Bending... 146 NB-4220 Forming Tolerances... 147 NB-4230 Fitting and Aligning... 151 NB-4240 Requirements for Weld Joints in Components... 152 NB-4250 Welding End Transitions Maximum Envelope... 160 NB-4300 Welding Qualifications... 160 NB-4310 General Requirements... 160 NB-4320 Welding Qualifications, Records, and Identifying Stamps... 163 NB-4330 General Requirements for Welding Procedure Qualification Tests... 164 NB-4350 Special Qualification Requirements for Tube-to-Tubesheet Welds... 166 NB-4360 Qualification Requirements for Welding Specially Designed Welded Seals... 168 NB-4400 Rules Governing Making, Examining, and Repairing Welds... 169 NB-4410 Precautions to Be Taken Before Welding... 169 NB-4420 Rules for Making Welded Joints... 169 NB-4430 Welding of Attachments... 171 NB-4440 Welding of Appurtenances... 172 NB-4450 Repair of Weld Metal Defects... 172 A06 NB-4500 Brazing... 175 NB-4510 Rules for Brazing... 175 NB-4520 Brazing Qualification Requirements... 175 NB-4530 Fitting and Aligning of Parts to Be Brazed... 177 NB-4540 Examination of Brazed Joints... 177 NB-4600 Heat Treatment... 177 NB-4610 Welding Preheat Requirements... 177 NB-4620 Postweld Heat Treatment... 177 NB-4630 Heat Treatment of Welds Other Than the Final Postweld Heat Treatment... 189 NB-4650 Heat Treatment After Bending or Forming for Pipes, Pumps, and Valves... 190 NB-4660 Heat Treatment of Electroslag Welds... 190 NB-4700 Mechanical Joints... 190 NB-4710 Bolting and Threading... 190 NB-4720 Bolting Flanged Joints... 190 NB-4730 Electrical and Mechanical Penetration Assemblies... 190 Figures NB-4221.1-1 Maximum Difference in Cross-Sectional Diameters... 148 NB-4221.2(a)-1 Maximum Permissible Deviation e From a True Circular Form... 149 ix
A06 A06 A06 NB-4221.2(a)-2 Maximum Arc Length for Determining Plus or Minus Deviation... 150 NB-4233(a)-1 Butt Weld Alignment and Mismatch Tolerances for Unequal I.D. and O.D. When Components Are Welded From One Side and Fairing Is Not Performed... 153 NB-4243-1 Acceptable Full Penetration Weld Details for Category C Joints (NB- 3352.3)... 154 NB-4244(a)-1 Nozzles Joined by Full Penetration Butt Welds... 155 NB-4244(b)-1 Nozzles Joined by Full Penetration Corner Welds... 156 NB-4244(c)-1 Deposited Weld Metal Used as Reinforcement of Openings for Nozzles... 157 NB-4244(d)-1 Partial Penetration Nozzles... 158 NB-4244(d)-2 Partial Penetration Nozzle for Coaxial Cylinders... 159 NB-4244(e)-1 Oblique Connections... 160 NB-4246(a)-1 Typical Piping Branch Connections Joined by Full Penetration Welds... 160.1 NB-4246(b)-1 Typical Piping Branch Connections Joined by a Fillet Weld or a Partial Penetration Weld... 160.2 NB-4250-1 Welding End Transitions Maximum Envelope... 161 NB-4250-2 Component to Pipe Weld... 162 NB-4250-3 Pipe to Pipe Weld... 162 NB-4427-1 Fillet and Socket Weld Details and Dimensions... 173 NB-4433-1 Types of Attachment Welds... 174 NB-4440-1 NB-4511-1 Appurtenance Weld Joint Details Size NPS 2 (DN 50) and Smaller (Not Applicable to Joints Between the Appurtenance and the Component)... 174.1 Brazed Connections for Appurtenances and Piping, NPS 1 (DN 25) and Less... 176 NB-4622.9(c)(5)-1 Temper Bead Weld Repair and Weld Temper Bead Reinforcement... 184 NB-4622.9(c)(5)-2 Temper Bead Reinforcement... 184 NB-4622.9(f)-1 Qualification Test Plate... 185 NB-4622.11(c)(6)-1 Temper Bead Weld Repair and Weld Temper Bead Reinforcement of Dissimilar Metal Welds or Buttering... 188 Tables NB-4232-1 Maximum Allowable Offset in Final Welded Joints... 151 NB-4524-1 Maximum Design Temperatures for Brazing Filler Metal... 177 NB-4622.1-1 Mandatory Requirements for Postweld Heat Treatment of Welds... 179 NB-4622.4(c)-1 Alternative Holding Temperatures and Times... 180 NB-4622.7(b)-1 Exemptions to Mandatory PWHT... 181 Article NB-5000 Examination... 191 NB-5100 General Requirements for Examination... 191 NB-5110 Methods, Nondestructive Examination Procedures, and Cleaning... 191 NB-5120 Time of Examination of Welds and Weld Metal Cladding... 191 NB-5130 Examination of Weld Edge Preparation Surfaces... 192 NB-5140 Examination of Welds and Adjacent Base Material... 193 NB-5200 NB-5210 NB-5220 NB-5230 Required Examination of Welds for Fabrication and Preservice Baseline... 193 Category A Vessel Welded Joints and Longitudinal Welded Joints in Other Components... 193 Category B Vessel Welded Joints and Circumferential Welded Joints in Piping, Pumps, and Valves... 193 Category C Vessel Welded Joints and Similar Welded Joints in Other Components... 193 x
NB-5270 Special Welded Joints... 195 NB-5280 Preservice Examination... 195 NB-5300 Acceptance Standards... 196 NB-5320 Radiographic Acceptance Standards... 196 NB-5330 Ultrasonic Acceptance Standards... 196 NB-5340 Magnetic Particle Acceptance Standards... 196 NB-5350 Liquid Penetrant Acceptance Standards... 197 NB-5360 Eddy Current Preservice Examination of Installed Nonferromagnetic Steam Generator Heat Exchanger Tubing... 197 NB-5370 Visual Acceptance Standards for Brazed Joints... 197 NB-5380 Bubble Formation Testing... 197 NB-5400 Final Examination of Vessels... 198 NB-5410 Examination After Hydrostatic Test... 198 NB-5500 Qualifications and Certification of Nondestructive Examination Personnel... 198 NB-5510 General Requirements... 198 NB-5520 Personnel Qualification, Certification, and Verification... 198 NB-5530 Records... 199 Table NB-5111-1 Thickness, Penetrameter Designations, Essential Holes, and Wire Diameters... 192 Article NB-6000 Testing... 200 NB-6100 General Requirements... 200 NB-6110 Pressure Testing of Components, Appurtenances, and Systems... 200 NB-6120 Preparation for Testing... 201 NB-6200 Hydrostatic Tests... 201 NB-6210 Hydrostatic Test Procedure... 201 NB-6220 Hydrostatic Test Pressure Requirements... 202 NB-6300 Pneumatic Tests... 202 NB-6310 Pneumatic Testing Procedures... 202 NB-6320 Pneumatic Test Pressure Requirements... 202 NB-6400 Pressure Test Gages... 203 NB-6600 Special Test Pressure Situations... 203 NB-6610 Components Designed for External Pressure... 203 NB-6620 Pressure Testing of Combination Units... 203 Article NB-7000 Overpressure Protection... 204 NB-7100 General Requirements... 204 NB-7110 Scope... 204 NB-7120 Integrated Overpressure Protection... 204 xi
NB-7130 Verification of the Operation of Reclosing Pressure Relief Devices... 204 NB-7140 Installation... 205 NB-7150 Acceptable Pressure Relief Devices... 205 NB-7160 Unacceptable Pressure Relief Devices... 206 NB-7170 Permitted Use of Pressure Relief Devices... 206 NB-7200 Overpressure Protection Report... 206 NB-7210 Responsibility for Report... 206 NB-7220 Content of Report... 206 NB-7230 Certification of Report... 207 NB-7240 Review of Report After Installation... 207 NB-7250 Filing of Report... 207 NB-7300 Relieving Capacity... 208 NB-7310 Expected System Pressure Transient Conditions... 208 NB-7320 Unexpected System Excess Pressure Transient Conditions... 208 NB-7400 Set Pressures of Pressure Relief Devices... 208 NB-7410 Set Pressure Limitations for Expected System Pressure Transient Conditions... 208 NB-7420 Set Pressure Limitation for Unexpected System Excess Pressure Transient Conditions... 208 NB-7500 Operating and Design Requirements for Pressure Relief Valves... 209 NB-7510 Safety, Safety Relief, and Relief Valves... 209 NB-7520 Pilot Operated Pressure Relief Valves... 210 NB-7530 Power Actuated Pressure Relief Valves... 211 NB-7540 Safety Valves and Pilot Operated Pressure Relief Valves With Auxiliary Actuating Devices... 212 NB-7550 Alternative Test Media... 212 NB-7600 Nonreclosing Pressure Relief Devices... 213 NB-7610 Rupture Disk Devices... 213 NB-7620 Installation... 214 NB-7700 Certification... 214 NB-7710 Responsibility for Certification of Pressure Relief Valves... 214 NB-7720 Responsibility for Certification of Nonreclosing Pressure Relief Devices... 214 NB-7730 Capacity Certification Pressure Relief Valves Compressible Fluids... 214 NB-7740 Capacity Certification of Pressure Relief Valves Incompressible Fluids... 217 NB-7800 Marking, Stamping, and Data Reports... 219 NB-7810 Pressure Relief Valves... 219 NB-7820 Rupture Disk Devices... 220 NB-7830 Certificate of Authorization to Use Code Symbol Stamp... 220 Article NB-8000 Nameplates, Stamping, and Reports... 221 NB-8100 General Requirements... 221 xii